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Use smaller tubes and accelerate the output from the vacuum cleaner by narrowing the output down with a cone.
"... but for future use I would like to shoot Doctor Beaver and JimBob as they have declared war upon me.
Ane (sic) me a Lady too.
... I have to build many many things in the next fortnight, including a safe gherkin electricution machine.
Sophie, yes I tried the tube narrowing and it was rubbish. I did the tube lengthening and it did have a bit of an effect but best was to build up the vacuum before releasing the projectile. I didn't try an industrial vacuum but I think that would help a lot. obviously time constraints and budget prevented this.
Dave shorts, I nearly booked you lot once for Intech but my evil CEO wouldn't let me.
Don't know much about vacuum cleaner bazookas, but we used to make potato guns that would launch a potato over 100 meters